Once of the most important purchases that one can make when building an AR-15 rifle is a good, quality lower parts kit. Known for quality, the Bushmaster lower parts kit is one of the most highly regarded kits on the market thanks to a long standing reputation for excellence. Everything you need to complete your lower receiver with the exception of the receiver extension, buffer and buffer spring.
All needed springs, pins, and parts are included and are finished to proper military specifications. Includes a standard A2 style pistol grip, and a trigger guard.